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We report experimental results on a two frequency gyrotron, operating in the ${\rm TE}_{22,6}$ mode at 110 GHz and the ${\rm TE}_{24,7}$ mode at 124.5 GHz. The gyrotron uses the same electron gun as a previous single frequency 110-GHz gyrotron, with a new cavity and internal mode converter designed for optimized performance at the two frequencies. For a 98 kV, 42-A electron beam operating in 3-...
Megawatt gyrotrons have a variety of applications including electron cyclotron heating (ECH) of plasmas in fusion devices. High efficiency operation is necessary to minimize the prime power required and to ensure good reliability of the device over its lifetime. To achieve high power and efficiency at the required frequencies, the gyrotrons must utilize large, overmoded cavities that face severe mode...
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